n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 28 |
4 | 215 |
5 | 1983 |
6 | 19789 |
7 | 213698 |
8 | 2426851 |
9 | 28661509 |
10 | 348287354 |
11 | 4322627557 |
12 | 54508747790 |
13 | 695534616050 |
14 | 8953637420349 |
15 | 116002300640637 |
16 | 1509724588732027 |
17 | 19707310304585212 |
18 | 257698683361191598 |
19 | 3372154116182404890 |
20 | 44121356408759264549 |
[1,1,4,28,215,1983,19789,213698,2426851,28661509, 348287354,4322627557,54508747790,695534616050, 8953637420349,116002300640637,1509724588732027, 19707310304585212,257698683361191598, 3372154116182404890,44121356408759264549] |